M&S says

Be prepared with a spare shirt for every day of the school week with this economic five pack of school shirts. Each shirt in this pack has our Easy to Iron finish that keeps children looking sharp throughout the day while also making laundering a breeze. A high-quality cotton mix fabric and stretch cuffs keep them comfortable during the school day, making a great set of school shirts you’ll be able to rely on throughout the term.

Care and Composition

35 days to return
You may return unused products within 35 days of purchase with a valid parcel summary document. Your items don't need to be in the original box or bag as long as they're securely packaged.

How to return
Simply use our returns portal to print a returns label and returns note. You will then be able to return all or part of your order at your own cost through your preferred carrier. To create a returns label, visit our returns portal select this option and follow the instructions.